(1)Tuan, N. A.; Thanh, N. V.; Nu, T. T. T.; Sinh, N. H.; Khai, V. V.; Chi, D. H.; Katayama, S.- ichi. Computational Design of Mn4< SUB> Molecules With Strong Intramolecular Exchange Coupling. Comm. Phys. 2011, 21, 137.